Combustion modified flexible polyurethane foam

Abstract

The present invention is directed to a combustion modified flexible polyurethane foam produced by reacting: (A) an organic polyisocyanate, (B) a polyether polyol selected from the group consisting of (i) a polymer polyol, and (ii) mixtures of said polymer polyol and a polyoxyalkylene triol having an OH number of from about 25 to about 40, (C) from about 80 to about 150 parts by weight of hydrated alumina of an average particle size of from about 1.5 to about 5 microns, (D) from about 4 to about 12 parts by weight of antimony trioxide, (E) from about 5 to about 30 parts by weight of decabromodiphenyl oxide, (F) from about 15 to about 30 parts by weight of a halogenated phosphate ester, (G) from 0 to about 5 parts by weight of a char former, (H) from about 1.5 to about 3.5 parts by weight of water, and, (I) from 0 to about 20 parts by weight of an organic blowing agent, said parts by weight of components (C) through (I) being based on 100 parts by weight of component (B), the ratio of components being such that the isocyanate index is from about 105 to about 115.

What is claimed is: 
     
       1. A combustion modified flexible polyurethane foam produced by reacting: (A) an organic polyisocyanate,   (B) a polyether polyol selected from the group consisting of (i) a polymer polyol prepared by polymerizing an ethylenically unsaturated monomer or monomers in a relatively high molecular weight organic compound containing at least two hydroxyl groups, and   (ii) mixtures of said polymer polyol and a polyoxyalkylene triol having an OH number of from about 25 to about 40,     (C) from about 80 to about 150 parts by weight of hydrated alumina of an average particle size of from about 1.5 to about 5 microns,   (D) from about 4 to about 12 parts by weight of antimony trioxide,   (E) from about 5 to about 30 parts by weight of decabromodiphenyl oxide,   (F) from about 15 to about 30 parts by weight of a halogenated phosphate ester,   (G) from 0 to about 5 parts by weight of a char former,   (H) from about 1.5 to about 3.5 parts by weight of water, and   (I) from 0 to about 20 parts by weight of an organic blowing agent, said parts by weight of components (C) through (I) being based on 100 parts by weight of component (B), the ratio of components being such that the isocyanate index is from about 105 to about 115.     
     
     
       2. The foam of Claim 1 wherein component (C) is used in an amount of from about 100 to about 140 parts by weight, component (G) is used in an amount of from about 1 to 2.5 parts by weight, and component (H) is used in an amount of from about 2 to about 3 parts by weight. 
     
     
       3. The foam of claim 2 wherein component (C) is used in an amount of from about 100 to about 120 parts by weight. 
     
     
       4. The foam of claim 1 wherein the polyisocyanate is a tolylene diisocyanate. 
     
     
       5. The foam of claim 1 wherein component (B) is a mixture of a polymer polyol and a polyoxyalkylene triol based on glycerin and having a propylene oxide internal block and ethylene oxide tipping. 
     
     
       6. The foam of claim 5 wherein the average particle size of component (C) is from about 3 to about 4 microns. 
     
     
       7. The foam of claim 6, wherein component (F) is tetrakis-(2-chloroethyl)-ethylene diphosphate. 
     
     
       8. The foam of claim 6 wherein component (D) is tetrakis-(2-chloroethyl)-2-bis-(chloromethyl)-propylene diphosphate.